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One of the most spectacular discoveries of molecular astronomy has been the detection of maser emission. The same radiation that is generated in the laboratory only with elaborate, special equipment occurs naturally in interstellar space. This intense radiation probes the smallest structures that can be studied with radio telescopes. By a fortunate coincidence maser radiation is generated in both star forming regions and the envelopes of late-type stars. The early and late stages in the life of a star are considered to be the most interesting phases of stellar evolution. Maser emission has also been detected in external galaxies. This book provides an extensive coverage of the interstellar maser phenomenon. A precondition for maser action is departure from thermal equilibrium. The book therefore starts with a detailed coverage of the basic background concepts required for an understanding of line formation and radiative transfer. It goes on to describe the theoretical and phenomenological aspects of interstellar masers, their formation sites and the inversion mechanisms. The book will interest active researchers in astronomy and astrophysics as well as in other areas of physics. It is suitable as a textbook in a graduate course and will enable a graduate student to embark on research projects in this exciting area in particular, and molecular radio astronomy in general.

Astronomical masers --- Celestial masers --- Interstellar masers --- Astronomical masers.

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Star spectroscopy --- 521.03 --- Astronomical masers --- Celestial masers --- Interstellar masers --- Masers, Celestial --- Interstellar matter --- Masers --- Radio sources (Astronomy) --- Theoretical astronomy. Celestial mechanics--?.03 --- Astronomical masers. --- 521.03 Theoretical astronomy. Celestial mechanics--?.03

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The subject of wave-particle interactions occurring in space plasmas has developed strongly, both observationally and theoretically, since the discovery of the Van Allen radiation belts of energetic charged particles trapped in the Earth's magnetosphere over forty years ago. These wave-particle interactions are recognized today as being a most important research topic in space plasma physics. This book provides a full and systematic description of the physical theory of whistler and Alfvén cyclotron masers acting in planetary magnetospheres, and in the Sun's outer atmosphere. The book introduces research topics by examining significant problems in the subject. It gives sufficient detail on the topic that readers can go on to apply the methods presented to new problems, helping them with their own research. This book is a valuable reference for researchers and graduate students working in space science, solar-terrestrial physics, plasma physics, and planetary sciences.

Astronomical masers. --- Cyclotrons. --- Plasma waves. --- Astrophysics. --- Cosmology. --- Astronomy --- Deism --- Metaphysics --- Astronomical physics --- Cosmic physics --- Physics --- Plasma sound waves --- Acoustic surface waves --- Magnetohydrodynamics --- Plasma (Ionized gases) --- Waves --- Cyclotron --- Magnetic resonance accelerators --- Particle accelerators --- Celestial masers --- Interstellar masers --- Masers, Celestial --- Interstellar matter --- Masers --- Radio sources (Astronomy)